renames Typed to Vm

lib/vm/tree/call_site.rb

@@ -0,0 +1,12 @@
+module Vm
+  module Tree
+    class CallSite < Expression
+      attr_accessor :name , :receiver , :arguments
+
+      def to_s
+        str = receiver ? "#{receiver}.#{name}" : name.to_s
+        str + arguments.collect{|a| a.to_s }.join(",")
+      end
+    end
+  end
+end